The total number of unique addresses that have deposited 32 ETH to the ETH2 deposit contract. Note that there is not necessarily always a direct relationship between an individual address and a validator, e.g. a single validator can deposit funds from multiple addresses to the ETH2 contract.

This is the Point-in-Time (PiT) variant of ETH 2.0 Total Number of Validators. PiT metrics are strictly append-only and their history is immutable. The historic data does not necessarily reflect the best current knowledge, but the information at the time when a data point was first computed. PiT metrics are ideal candidates for applications in model backtesting and related quantitative purposes. Read our article on PiT metrics for more information.